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blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17850

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

irishhawk11 wrote:

--> Is it possible the the pressure valve released? I read that this needs to be replaced when the valve is triggered.

Yes, it is possible for the PRV to pop and the valve does not reset once popped. A popped valve is always always a consequence of a faulty VCV (remember that the VCV is the control for the fuel rail pressure) but most VCV fault do not cause the PRV to pop. If the PRV has popped the according to LR the entire fuel rail must be replaced, but aftermarket PRVs are available and it is possible to replace just the valve. However I don't think that this is what is happening in your case since the error code specifically reports that there is a fault with the fuel rail pressure sensor (the thing at the opposite end of the rail to the PRV) circuit, it is not reporting that there is no (or low) fuel rail pressure, which is what it would be doing in the case of a popped PRV. If you are going to randomly replace something you are probably better off replacing the sensor than the valve.

irishhawk11 wrote:

--> or could this failure be because I opened them middle valve of the fuel rail to check if fuel is coming, which wasn't the case...?

Unlikely unless whilst doing this you did collateral damage to something else. The centre union (and I presume you mean union and not valve) is the supply line from the HP stage of the pump into the rail and whilst loosening this will cause the rail to lose pressure and could conceivably allow air to enter the rail, the rail will self-bleed via the fuel return circuit. Remember that there is no need and no procedure for bleeding the HP circuit, only the LP circuit.

The P019015 error code ("Fuel rail pressure sensor A circuit - circuit short to battery or open") is very specific and points to an electrical fault not a fuel rail pressure fault. The lack of pressure is a consequence not the cause.

9th Jul 2025 3:31pm

irishhawk11

Member Since: 07 Mar 2022
Location: Feldkirch
Posts: 21

2011 Defender 90 Puma 2.4 HT Santorini Black

What u think regarding the fuelrail pressure when trying to start?

Click image to enlarge

i bled the fuel system and some air has come out but not a lot...

9th Jul 2025 4:56pm

andy63

Member Since: 30 Jun 2023
Location: north east
Posts: 785

If I'm reading that correctly there is no high pressure.. 250kpa is between 2 and 3 bar..you would need to see something approaching 200bar for the injectors to fire..

9th Jul 2025 6:49pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17850

The DTC is pointing to a problem with the pressure sensor so it is very unlikely you'll get sensible and correct readings.

As stated several times now you need to establish that the ECM is getting sensible measurements from the sensor.

9th Jul 2025 10:33pm

irishhawk11

Member Since: 07 Mar 2022
Location: Feldkirch
Posts: 21

Here a short video of the starting problem:

https://youtube.com/shorts/zi_O3sJ7px4?si=n9ZkaMiOSCsDI26y

9th Jul 2025 11:25pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8318

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Have you checked the engine loom to vehicle loom connector at the rear right of the engine, it would be behind the vcv and area younwere working in. Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

10th Jul 2025 10:22am

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